Cutter-head.



Patented Sept. 5, I899.

c. ANDERSON.

CUTTER HEAD.

No. 632,6l8.

UNITED STATES PATENT I CHRISTIAN ANDERSON, OF OHIPPEWA FALLS, \VISCONSIN.

CUTTER-HEAD.

SPECIFICATION forming part of Letters Patent No. 632,618, dated September 5, 1899.

Application filed December 6, 1898. Serial No. 698,464. (No model.)

To (tZZ whom it may concern:

Be it known that I, CHRISTIAN ANDERSON, a citizen of the United States, residing at Chippewa Falls, in the county of Chippewa and State of Wisconsin, have invented a new and useful Gutter-Head for Planing-Machines, of which the following is a specification.

My invention relates to cutter-heads for su rface-planers and jointer-heads; and the object in view is to provide a simple and improved construction of cylinder and knife-securing devices whereby a knife consisting of a flat straight-edged plate may be employed and may be promptly and effectually secured in place to cause an efficient cooperation of the several knives carried by the cylinder.

Further objects and advantages of this invention will appear in the following description, and the novel features thereof will be particularly pointed out in the appended claims.

In the drawings, Figure 1 is a perspective view of a cutter-head constructed in accordance with my invention. Fig. 2 is a transverse section of the same, taken partly in the plane of one of the circumferential channels. Fig. 3 is a detail view of a portion of one of the blade-securing wedges.

Similar reference characters indicate corresponding parts in all the figures of the drawings.

1 designates a cylinder which is provided in its periphery with a series of longitudinal grooves 2,formingknifc-seats. These grooves are cross-sectionally tapered from the surface of the cylinder inward, and the knives 3, which are arranged in the grooves in contact with one of the side walls thereof, preferably do not extend to the bottom of the grooves, but terminate adjacent to offset shoulders 4, formed upon the walls against which the knives rest. The knives are secured in the seats by means of cross-sectionally wedgeshaped strips 5, which may extend continuously from one end of the cylinder to the other, or, in other words, may consist of a single bar or may be sectional, as preferred. The wedges or knife-holding strips are preferably concave at their outer edges adjacent to the blade and convex adjacent to the wall of the seats remote from the blade and are so proportioned with relation to the grooves in which they fit as to terminate at their inner edges short of the floors or bottoms of the grooves to adapt them for adjustment as the contacting faces of the parts become worn. These strips are held in place by means of adjusting devices consisting of bolts or screws 6 or the equivalent thereof, which extend through the strips from their outer to their inner edges, with the heads or nuts at their outer ends suitably countersunk to avoid projection. By having the strips formed at their outer edges in the manner shown-that is, with their forward edge portion convex and their rear edge portion concavethe divergent sides or faces of the strips obtain a bearing against the divergent walls of the knife-seats throughout their extent and the concaved edge portion affords clearance for the cuttings or chips. The inner ends of these securing and adjusting bolts are engaged with the floors of the grooves, or, preferably, as shown in the drawings, with gibs 7, which arecross-sectionally dovetailed to fit in corresponding cross-sectionally-shaped ways Sin the doors or hottoms of the grooves. In the construction illustrated the adjusting devices 6 consist of cap-screws, which extend inwardly from the outer edges of the wedges with their heads arranged in the countersinks and with their inner ends threaded in suitable sockets formed in thegibs, and by reason of the adjustable fitting of the gibs in the ways provided therefor adjustment of the wedge is allowed longitudinally of the cylinder. These adjustable gibs, however, are of particular advantage in connection with the sectional wedges 5, (illustrated in Fig. 1,) in that they provide for securing in place bits when the machine is to be used as a matcher or header. The members of the wedge or knife-holding strip may be adjusted to suit the desired positions of the bits.

In connection with the adjustment of the knives or bits suitable gages (not shown in the drawings) may be employed; but in order that the knives may be moved outward when desired to secure a uniform adjustment thereof 1 preferably provide the cylinder with circumferential channels 9 of sufficient depth the cutter-head.

to extend approximately to the floors of the knifeseats, whereby a thin bladed instrument may be inserted and brought into contact with the rear edges or backs of the knives to advance them toward the periphery of the cylinder. These circumferential grooves intersect the knife-seats, as will be understood by reference to Fig. 2.

In addition to the function of securing the knives in place the holding-strips 5 perform the function of chip-breakers, in that the knives are arranged in contact with the rear walls of the knife-seats or grooves 2, and hence cause the outer edges of the Wedges to precede the knife edges in the operation of Chips cut from the surface of the board by the knives are turned up into contact with the outer edges of the wedges,

and hence are detached or broken to prevent the choking or clogging of the cutting devices.

The adjustment or removal of the knives (as for the substitution of other knives or bits) may be accomplished by the simple loosening of the holding-strip-adj usting devices, and hence without the removal of said strips.

In the drawings the longitudinal knifeseats are formed parallel with the axis of the cylinder; but it is obvious that, as in the ordinary practice, a shearing cut may be obtained by disposing the seats diagonally with relation to the axis or extending them spi,

rally of the surface of. the cylinder; but I have deemed it unnecessary to illustrate this arrangement for the reason that knives heretofore have been arranged otherwise than parallel with the axis of the cylinder.

It will be understood that in practice various changes in the form, proportion, and the minor details of the construction may be resorted to Without departing from the spirit or sacrificing any of the advantages of the invention.

Having described my invention, what I claim is l. A cutter-head havingacylinder provided with longitudinal knife-seats, a cross-sectionally-dovetailed gib fitted in the channel in the floor of one of the knife-seats, a sectional 5o strip fitted in the knife-seat for holding a knife in its adjusted position, and bolts connectin g the sections of the strip with said gibs, substantially as specified.

2. A cutter-head having longitudinal crosssectionally-tapered knife-seats, cross-sectionally-Wedge-shaped knife-holding strips fitted in said seats, gibs mounted in the knife-seats adjacent to the floors thereof, and strip-adjusting bolts engaged with said gibs and ex-. tending through the strips to their outer edges, substantially as specified.

3. Acutter-head havinga cylinderprovided with longitudinal cross-sectionally-tapered knife-seats, knife-holding strips fitted in said seats, cross-sectionally-dovetailed gibs fitted in cross-sectionally-dovetailed ways in the floors of the knife-seats, and bolts engaged with said gibs and extending to the outer edges of the strips to secure the latter at the desired adjustment, substantially as specified.

4. Acutter-head havingacylinder provided with longitudinal knife-seats, and adjustable means fitted in said knife-seats to secure knives at the desired adjustment, the cylinder being provided with circumferential grooves intersecting the knife-seats to give access to the rear edges or backs of the knives, substantially as specified.

' In testimony that I claim the foregoing as my own I have hereto affixed my signature in the presence of two witnesses.

CHRISTIAN ANDERSON.

\Vitnesses:

H. H. TODD, R. ALLEN. 

